The EXIT sets/resets the appropriate error code. Thus in a function
code:
function test($a)
  ;something happens
  $test='returnvalue'
  exit 0
endfucntion
The @ERROR macro will be actively set to '0' independent on whatever value it had before.
Alternatively, I can for example do an EXIT 87 to set the @ERROR macro to 87. I also try to mimic the regular KiXtart behavior as much as possible.
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There are two types of vessels, submarines and targets.